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t in (-oo:+oo)
(1/2)*t = 31/2 // - 31/2
(1/2)*t-(31/2) = 0
(1/2)*t-31/2 = 0
1/2*t-31/2 = 0 // + 31/2
1/2*t = 31/2 // : 1/2
t = 31/2/1/2
t = 31
t = 31
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